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Subject[PATCH 00/11] EFI runtime services virtual mapping
From: Borislav Petkov <>

Hi all,

here's finally a new version of the runtime services VA mapping patchset
which hopefully implements hpa's idea of statically mapping EFI runtime
regions in a top-down manner starting at -4Gb virtual.

We're also using a different pagetable so as not to pollute kernel
address space. For that, we switch to that table before doing an EFI
call, and afterwards we switch back to the previous one.

To the patches:

1-2 are simple cleanups which Matt probably can take now

3-10 add the machinery to map regions into an arbitrary PGD. Those I've
split deliberately into very small bites so that they can be reviewed
more thoroughly and easily for my pagetable skills are pretty basic.

11 is the actual patch which implements that mapping so that we can use
runtime services in kexec (which is the whole reason for this fuss :))

So please take a long hard look at those, hammer on them on your
boxes and let me know. They boot fine on my Dell UEFI box and in OVMF
(obviously :)).


Borislav Petkov (11):
efi: Simplify EFI_DEBUG
x86, pageattr: Lookup address in an arbitrary PGD
x86, pageattr: Add a PGD pagetable populating function
x86, pageattr: Add a PUD pagetable populating function
x86, pageattr: Add a PMD pagetable populating function
x86, pageattr: Add a PTE pagetable populating function
x86, pageattr: Add a PUD error unwinding path
x86, pageattr: Add last levels of error path
x86, cpa: Map in an arbitrary pgd
EFI: Runtime services virtual mapping

arch/x86/boot/compressed/eboot.c | 12 +-
arch/x86/boot/compressed/eboot.h | 1 -
arch/x86/include/asm/efi.h | 58 +++--
arch/x86/include/asm/pgtable_types.h | 3 +-
arch/x86/mm/pageattr.c | 461 +++++++++++++++++++++++++++++++++--
arch/x86/platform/efi/efi.c | 126 +++++-----
arch/x86/platform/efi/efi_64.c | 56 +----
arch/x86/platform/efi/efi_stub_64.S | 47 ++++
include/linux/efi.h | 6 +-
9 files changed, 615 insertions(+), 155 deletions(-)


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